APA (7th ed.) Citation

(1971). APL PLUS: File subsystem. [Scientific Time Sharing Corporation?].

Chicago Style (17th ed.) Citation

APL PLUS: File Subsystem. [Bethesda, Md.]: [Scientific Time Sharing Corporation?], 1971.

MLA (9th ed.) Citation

APL PLUS: File Subsystem. [Scientific Time Sharing Corporation?], 1971.

Warning: These citations may not always be 100% accurate.